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TouchUp 



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TouchUp 

Written By: Kai Kwadwo Rohan 



f TOOLS: 



Wire stripper/crimper (1) 



PARTS: 



Arduino Uno (1) 

LinkSprite CuHead WiFi Shield (1) 

Router (1) 

any basic home router should work 

jPadJU 

5VDC/1A SPDT Micro Relay (6) 
From RadioShack. Model: 257-240. 
Catalog #: 275-240 

Standard Wire Kit (1) 

Molex Connector Kit (1) 
.062IN PWR CONNECTOR KIT PANEL 
MNT PLUG& RECEPT 15 CKT: Mfr. 
Part #: 76650-0070 

Connector Cable (1) 

can use one taken from an old handheld 
bed controller, needs minimum of 7 
separate wires 

Adjustable bed (1) 



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TouchUp 



SUMMARY 

TouchUp is a project initially developed to help a middle-aged woman who lives with multiple 
sclerosis (MS) in a caregiving facility. Due to the effects of MS, she has limited hand and 
arm strength to push the buttons on the handheld controller used to adjust her bed, a 
Hillrom-8400. Our goal was to develop an iPad application that she could use as an 
alternative to control her bed more easily. 

To complete this project, we divided it into three parts: a graphical user interface, an 
Arduino-to-bed connection, and a network which the Arduino and iPad application 
communicate over. The approach is as follows: 

• Build a GUI which our client can use to send desired actions to her bed 

• Connect Arduino to the Hillrom-8400 bed using a serial port 

• Establish a network which iPad and Arduino can communicate over 

• Send desired action from iPad to Arduino using an HTTP Get request 

• Arduino sends signal to bed's actuator based on desired action 





Goto 

http://arduino.cc/en/Main/Software 
and download appropriate IDE 
based on your operating system. 

Test that the Arduino works by 
loading a basic template onto the 
Arduino Uno. 

• Basic "blink" template can be 
found under File -> Examples 
-> 01. Basics -> Blink 



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TouchUp 





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• Download the zip file containing the WiShield library and the Arduino code. Keep a copy of 
the WiShield library under the library folder where the Arduino IDE libraries are kept; the 
Arduino code folder can be copied to the directory containing any projects. 

• One option for using the Arduino code is to open the code file and copy the 
contents into a new Arduino project. 

• In case the zip file does not work, the library for the LinkSprite CuHead WiFi Shield can 
be downloaded from here . 

• Follow the steps in this Jink to make the library compatible with the new Arduino IDE. 

• Plug in router and take note of the router's IP, network SSID, security type, password, and 
subnet mask. 

• In the Arduino code update the appropriate fields with the values from above (gatewayjp, 
subnetjnask, ssid, securityjype). 



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TouchUp 




10:31PM 



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• Download Xcode to begin 
developing. If you downloaded the 
TouchUp zip file, the folder should 
include code for a graphical user 
interface already. 

• Design a user interface with a total 
of five buttons and one label. Two 
of the buttons will be used for 
moving the bed up, two for moving 
the bed down, and one to switch 
modes (Bed, Feet, Head). Refer to 
iPad application tutorials if you are 



not familiar with this. 

Make sure to change the 
URL so that it matches the 
URL of your Arduino. 



A 



Test that the GUI can toggle a 
basic LED set up with the 
corresponding output pins in the 
Arduino (use only resistors, wires, 
and LEDs to do this; do not put the 
relays in yet). 



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TouchUp 





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Set up the relays on the breadboard as shown by the diagrams. Spread out the 6 relays 
across the breadboard. 

• Connect the (-) strip to the ground pin on the Arduino and each relay common pin to the 
(+) strip. 







The bed pins will be connected in the next few steps after the Molex port has 
been put together. 

Make sure the relays are oriented correctly, and do NOT ground the left pin. We 
used SPDT relays, which would short the rest of the circuit when a switch is 
"open." If you find that nothing works after you have put everything together, check that 
this pin is not connected to anything that shorts the circuit! 




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TouchUp 










M>„ . . FEET 

* s. * 



Molex Connector has room for 15 pins, but we will only use 7 male pins from the kit. 

Attach individual wires from the connector cable to terminals using the crimping tool. 

Keep track of which wires connect to which pins -- they need to correspond to the correct 
Arduino output pins. 



I kept track by looking at the colors of each wire, which I have labeled in the 
diagram. Make sure that you are looking at the diagram as if the pins were 
sticking out towards you. 

Any of the three pins down the middle column will work as a common pin. We 
arbitrarily chose the top pin and attached it to the red wire. 



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TouchUp 





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Attach the free ends of the wires from the connector cable to the terminal block. 

• The wires we used were too difficult to put into the breadboard directly, so we 
attached stiff wires to the other side of the terminal block. This is only one of 
many ways to connect the wires securely to the Arduino board. 

Make sure that the Common Pin connector is connected to the + strip, and that the 
Bed Control pins are connected to the corresponding terminals of the relay. 





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TouchUp 




Put all of the components into a project box. 

• Make sure Arduino code is uploaded into the Arduino. 



* 



• Plug the Molex connector into one of the Hillrom-8400 ports and power up the Arduino. 

• Load finished iPad application onto an iPad and connect to WiFi. 

• Once the red light on the WiFi Shield has lit up, the Arduino is connected and you should 
be able to control the bed from the iPad! 



This document was last generated on 201 2-1 2-1 6 06:08:29 AM. 



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Page 8 of 8